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Finding the Fourth Proportional to 892.44, 1,231.38 and 644.31

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Solution

The fourth proportional to 892.44, 1,231.38 and 644.31 is: 889.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.44 : 1,231.38 = 644.31 : x
  2. Step 2: Convert to fraction form
    892.44/1,231.38 = 644.31/x
  3. Step 3: Cross multiply
    892.44x = 1,231.38 × 644.31
  4. Step 4: Simplify right side
    892.44x = 793,390.45
  5. Step 5: Solve for x
    x = 793,390.45/892.44
  6. Step 6: Final answer
    x = 889.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.